311312121331 has 4 divisors (see below), whose sum is σ = 314394419664. Its totient is φ = 308229823000.

The previous prime is 311312121301. The next prime is 311312121343. The reversal of 311312121331 is 133121213113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311312121331 - 2⁵ = 311312121299 is a prime.

It is a super-2 number, since 2×311312121331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311312121301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1541149015 + ... + 1541149216.

It is an arithmetic number, because the mean of its divisors is an integer number (78598604916).

Almost surely, 2^311312121331 is an apocalyptic number.

311312121331 is a deficient number, since it is larger than the sum of its proper divisors (3082298333).

311312121331 is a wasteful number, since it uses less digits than its factorization.

311312121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082298332.

The product of its digits is 324, while the sum is 22.

Adding to 311312121331 its reverse (133121213113), we get a palindrome (444433334444).

The spelling of 311312121331 in words is "three hundred eleven billion, three hundred twelve million, one hundred twenty-one thousand, three hundred thirty-one".